RMH has it right. And you're worrying about the wrong things.

I'm not sure what you mean by "dampening" other than your spelling of the word involves water. "Damping" is the act of reducing motion. If you're looking at maintaining control over the surface and avoiding flutter then the most travel at the servo for angle and then to mechanically reduce the throw at each end of the pushrod is the proper method.

If you can't limit the control surface travel by using the pushrod at the outer hole then switch the output arm on the servo to a shorter one or use a more inward located hole.

The pins or wires in the end connections of the pushrods should be a snug but not tight fit in the holes. You want to reduce any play to the minimum.

And by using the full 100% travel provided by the maximum setting of the ATV and then mechanically reducing the travel via the correct pushrod and end horns you also tighten up on the centering consistency of the surfaces. All in all using full servo travel and proper mechanical setups is a win-win.